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Overhead distribution line is easy to suffer lightning trip upon strong thunderstorm due to its low design insulation level, which will reduce reliability of power distribution system. Considering the random annual changes of thunderstorm characteristic parameters, a long-term reliability model of overhead distribution line against thunderstorm disaster was established for strong thunderstorm regions based on the probability distribution model of thunderstorm characteristic parameters. This model takes insulator type and installation interval of arrester as the decision variables and views the cost of power distribution network in the whole life cycle as the objective function. The optimal thunderstorm-resistance planning of overhead distribution line was solved by using the genetic algorithm. The established model was used to make a thunderstorm-resistance planning of the RBTS-BUS2 system. Results showed that based on this model, grid planners could comprehend lightning strike risk level of the power distribution network according to intensity of regional thunderstorm characteristic parameters, and could make reliable and economical planning scheme of insulator type and arrester interval.

Thunderstorm-resistance Planning of Overhead Distribution Line